WIP: fixing invalid finalization from non-primary ES

[mdorier]

This branch/PR aims to fix the problem that appears when multiple ES use the pool from which margo_cleanup is called. This causes the ES that executes it to self-destruct, cutting short the finalization of margo.

I added a test (finalize_from_non_primary in margo-init unit test) showcasing the problem.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.65%. Comparing base (3a7a8e0) to head (c705b76).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   57.58%   57.65%   +0.06%     
==========================================
  Files          70       70              
  Lines        9877     9885       +8     
  Branches     1271     1271              
==========================================
+ Hits         5688     5699      +11     
+ Misses       3406     3402       -4     
- Partials      783      784       +1     

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